<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>grid</title>
</head>
<style>
    body{
        margin: 0;
    }
    .container {
  display: grid;
  grid-template-columns: 200px auto 200px;
  grid-template-rows: 100px auto 100px;
}

.header {
  grid-column: 1 / 4;
  grid-row: 1 / 2;
  background-color: aqua;
}

.content { 
  grid-column: 2 / 3;
  grid-row: 2 / 3;
  background-color: white;
  height: 1000px;
  
}

.left-sidebar {
  grid-column: 1 / 2;
  grid-row: 2 / 3;
  background-color: darkseagreen;
}

.right-sidebar {
  grid-column: 3 / 4;
  grid-row: 2 / 3;
  background-color: darkseagreen;
}

.footer {
  grid-column: 1 / 4;
  grid-row: 3 / 4;
  background-color: aqua;
}
</style>
<body>
    <div class="container">
        <div class="header">Header</div>
        <div class="left-sidebar">Left Sidebar</div>
        <div class="content">Content</div>
        <div class="right-sidebar">Right Sidebar</div>
        <div class="footer">Footer</div>
    </div>
</body>
</html>